How to determine in PHP that the current user has logged in elsewhere and the current user is elsewhere_PHP Tutorial

How does PHP determine that the current user has logged in elsewhere and the current user is elsewhere

Source: http://bbs.lampbrother.net/read-htm-tid-121909-ds -1.html#tpc

Main ideas:
1. When logging in, record the user’s SessionID
2. When verifying login, match the recorded user’s SessionID with the current SessionID
3. If they are not the same, explain in Log in elsewhere
Please see the demo code for details, there are comments inside.

http://www.bkjia.com/PHPjc/938096.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/938096.htmlTechArticlePHP How to determine that the current user has logged in elsewhere and the current user is elsewhere Source: http://bbs.lampbrother. net/read-htm-tid-121909-ds-1.html#tpc Main ideas: 1. When logging in, change the user's...